Fourth-seeded Juan Ignacio Chela of Argentina lost Monday on the first day of the CA Trophy, beaten by Florian Mayer of Germany 6-4, 6-4. Mayer broke Chela twice in the opening set and converted his first set point. In the fifth game of the second set, Mayer broke serve again. Another Argentine, sixth-seeded Guillermo Canas, fared better, beating wild card Julian Knowle of Austria 6-2, 6-4.